Antibiotics are undesirable as a long term strategy with problems of
bacterial resistance and tissue residence times.
The
most common treatment, trimethoprim, has a withholding period of
500 degree days which is unacceptable in commercial production
(S. Percival, pers. comm.). Amoxycillin is an alternative that has a
short withdrawal time of 50 degree days, but is less efficacious than
trimethoprim